ESTABLISHMENT,GROWTH AND CONSERVATION OF A MAINLAND COLONY OF JACKASS PENGUINS SPHENISCUS DEMERSUS AT STONY POINT,BETTY'S BAY,SOUTH AFRICA |
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| Authors: | Philip A. Whittington Jan H. Hofmeyr John Cooper |
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| Affiliation: | 1. Avian Demography Unit Department of Statistical Sciences , University of Cape Town , Rondebosch, 7700, South Africa;2. 10 Rouwkoop Avenue, Rondebosch, 7700, South Africa;3. Percy FitzPatrick Institute of African Ornithology, University of Cape Town , Rondebosch, 7700, South Africa |
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| Abstract: | Whittington, P.A., Hofmeyr, J.H. & Cooper, J. 1996. Establishment, growth and conservation of a mainland colony of Jackass Penguins Spheniscus demersus at Stony Point, Betty's Bay, South Africa. Ostrich 67: 144–150. Following the discovery of a single pair of Jackass Penguins Spheniscus demersus nesting on the mainland at Stony Point, Western Cape Province, South Africa (34 22S 18 53E) in 1982, a colony developed and has since been regularly monitored. Numbers of nests increased to 35 in 1986, until a leopard Panthera pardus severely reduced the size of the colony. Numbers subsequently rose again to a total of 139 nests in 1990, but fell to 57 in 1993. This decrease was probably due to predation by mammals. Following the use of a trap and translocation of the animals caught, the colony increased again in 1995 and 1996. Productivity of the colony was insufficient for it to be self-sustaining, and it therefore presently represents a population sink. |
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